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It is a convenient solution for isoelectric point measurements (pH at which zeta potential = 0). This accessory is available for the Zetasizer and automates the measurement of both particle size and zeta potential as a function of pH, dilution or additive concentration. A specialized capillary cell is necessary for this measurement in the Zetasizer and can be purchased in the MRL storeroom. Analysis of the superposition of incident and scattered beams, called Laser Doppler Velocimetry, enables the calculation of the zeta potential. As a result, the light scattered by the particles exits at a different frequency to the incident beam according to their velocity. The experiment is performed by passing an alternating electric field through the suspension and measuring the change in velocity of the particles, called electrophoresis.
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It is also related to the stability of the particles in the suspension.
![is the size malvern zetasizer radius or diamter is the size malvern zetasizer radius or diamter](https://www.researchgate.net/profile/Peter-Kralchevsky/publication/24443448/figure/fig15/AS:668425668018176@1536376506007/Size-distribution-of-the-micelles-of-Tween-20-obtained-by-dynamic-light-scattering-The.png)
Zeta potential is a property of particles in a suspension that relates to the charge on their surface. The Zetasizer can measure particle diameters in the range of 0.6 nm and 6 µm. A forward scattering angle of 13° is also available for particle size measurement. To accomplish this, the Zetasizer measures the scattering of the particles as they cross the incident beam of light at a backscattered angle of 175 °. From this the size (diameter or radius) of the particles can be determined. DLS measures the diffusion coefficient of particles undergoing Brownian motion in a fluid.